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Hannes Mühleisen

PROFILE

Hannes Mühleisen

Developed and maintained database extensions and deployment workflows for the duckdb/community-extensions and duckdb/duckdb-odbc repositories, focusing on reliability, automation, and cross-platform compatibility. Delivered the initial Avro extension for DuckDB, including documentation and usage examples, and iteratively improved its stability through version management and platform-specific adjustments. Enhanced CI/CD pipelines using Docker, GitHub Actions, and Python scripting to automate build artifact publishing and streamline release processes. Addressed deployment reliability by updating AWS S3 integration and archiving workflows. Contributed C++ and Bash code to resolve compatibility issues, improve cross-compilation, and ensure consistent extension quality across Linux, macOS, and ARM architectures.

Overall Statistics

Feature vs Bugs

86%Features

Repository Contributions

28Total
Bugs
1
Commits
28
Features
6
Lines of code
346
Activity Months3

Your Network

151 people

Shared Repositories

151

Work History

September 2025

3 Commits • 2 Features

Sep 1, 2025

September 2025 performance summary for duckdb/community-extensions. This month focused on reliability and maintenance of deployment workflows and extension quality. Key outcomes include stabilizing deployment and archiving processes by updating GitHub Actions to use AWS_ENDPOINT_URL instead of AWS_DEFAULT_REGION and by specifying an explicit archiving endpoint to target S3-compatible storage, reducing misconfigurations and deployment failures. In addition, the quack extension was upgraded to version 0.0.2 as a non-breaking maintenance release, with updates reflected in the description file. These efforts improve automation reliability, storage targeting accuracy, and overall extension stability for downstream users.

January 2025

14 Commits • 3 Features

Jan 1, 2025

January 2025 monthly summary for DuckDB community-extensions and duckdb-odbc focused on dependency hygiene, cross-platform CI reliability, and streamlined release processes. Delivered critical feature and stability work across two repos, enabling faster, safer releases and broader platform support.

December 2024

11 Commits • 1 Features

Dec 1, 2024

Monthly summary for 2024-12: Avro extension for DuckDB released in duckdb/community-extensions with initial feature delivery, documentation, usage examples, and metadata. Ongoing maintenance includes platform exclusion for WebAssembly, reference hash updates, and version bumps to maintain compatibility and functionality.

Activity

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Quality Metrics

Correctness92.2%
Maintainability93.6%
Architecture91.4%
Performance88.6%
AI Usage20.0%

Skills & Technologies

Programming Languages

BashC++PythonShellYAML

Technical Skills

API DevelopmentAPI IntegrationAWS S3Build AutomationBuild ManagementBuild System ConfigurationBuild SystemsC++CI/CDCloud DeploymentConfiguration ManagementCross-compilationData FormatsDatabase ExtensionsDocker

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

duckdb/community-extensions

Dec 2024 Sep 2025
3 Months active

Languages Used

YAMLC++

Technical Skills

Build ManagementBuild System ConfigurationConfiguration ManagementData FormatsDatabase ExtensionsVersion Control

duckdb/duckdb-odbc

Jan 2025 Jan 2025
1 Month active

Languages Used

BashC++PythonShellYAML

Technical Skills

API DevelopmentAPI IntegrationAWS S3Build AutomationBuild SystemsC++